Friends and Co-Stars Remember Paul Walker

Paul Walker attends the World Premiere of 'Fast & Furious 6' at Empire Leicester Square on May 7, 2013 in London, England.

Co-stars and friends of actor Paul Walker grieved on Twitter and Instagram as news of his death on Saturday spread over the weekend. Walker, 40, was already shooting the seventh installment in the Fast & Furious series.

Vin Diesel, who played Walker’s brother-in-law and best friend in the films, posted a picture of Walker and himself on his Instagram Saturday night, writing, “Brother I will miss you very much. I am absolutely speechless. Heaven has gained a new Angel. Rest in Peace.”

Ludacris, who co-starred with Walker in several of the Fast & Furious wrote on Sunday, “Your humble spirit was felt from the start, wherever you blessed your presence you always left a mark, we were like brothers & our birthdays are only 1 day apart, now You will forever hold a place in all of our hearts @paulwalker legacy will live on forever. R.I.P.”

Tyrese Gibson, another Fast co-star, posted: “My heart is hurting so bad no one can make me believe this is real Father God I pray that you send clarity over this cause I just don’t understand My heart hurts it’s broken no one can convince me that this is real…. Prayer warriors please pray real hard for his only child, his daughter and family…#HeartOfAnAngel13YrsFamilyForeverWeJustCelebreatedYour40thBirthday….. My God… My God… I can’t believe I’m writing this”